Actually, now that I think about it, young Biggs and Windy's adventures on Yavin more closely resemble those of Merry and Pippin in Fangorn Forest.
Merry and Pippin are captured by Orcs at the beginning of The Two Towers, but as the Orc army is traveling to Isengard it is attacked by the Rohirrim, and in the chaos the hobbits escape into Fangorn. There they meet Treebeard, leader of the Ents, a "shepherd of the trees."
Treebeard entertains the duo, telling them Entish stories and giving them drinks of the marvelous Ent-draught, which causes them to grow taller.
When they arrive on the jungle planet of Yavin, Biggs and Windy (the names are even similar--Windy is actually short for Windom, like Meriadoc Brandybuck or Peregrin Took) are kept safe in the house of Owen Lars. Owen is a human settler and anthropologist who studies the Wookees.
Owen and his wife Beru feed the two young boys generously during their stay. Unexpectedly, Imperial troops invade the house and capture them all, but as they are heading back to their base with their captives, the Wookees set upon them and free the hostages.
And, of course, the heroes' rousing of the Wookees to fight against the Imperial troops and take over their base is highly reminiscent of the Ents' attack upon Isengard.
More disturbingly, the one element of Leia's ordeal I neglected to mention in the last post--the use of electric-shock torture on her by General Darth Vader--is likely drawn from the Orcs' use of a whip on Frodo in Cirith Ungol.